Answer:
4 significant figures.
Explanation:
The given measurement have four significant figures 1234.
All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.
Leading zeros are not consider as a significant figures. e.g. 0.03 in this number only one significant figure present which is 3.
Zero between the non zero digits are consider significant like 104 consist of three significant figures.
The zeros at the right side e.g 2400 are also significant. There are four significant figures are present.
Average speed (aka average velocity) is the change in displacement (distance) over the chance in time.

The average velocity of the baseball is 15 meters/sec
Answer:
The energy released from food was once energy from the sun that was captured by plants in the chemical process that forms plant matter (from air and water). Food provides animals with the materials they need for body repair and growth and the energy they need to maintain body warmth and for motion.
Explanation:
It represent Alcohol group (—OH)
The second one is more concentrated as they both times with the same thing but the second one (1.5) is bigger